Acceptable way(s) to stack/bundle multiple NM cables

I feel like there's probably an easy answer to this question, but I haven't had much luck finding it here or on google: if I have multiple cables running up a 2x4, what is the best (inspector-approved) way to attach them and still keep them 1 1/4" from the edge of the stud?

For individual cables, I've been using the white plastic "staples" (like these: http://www.amazon.com/dp/B000BQNCIU). But these are only supposed to be used for one cable, right?

And, for bundling multiple cables where the 1 1/4" inch rule isn't in effect (like in the attic), I've just been using zip ties (and attaching them to joists/studs).

One recommendation I saw was to staple the first wire and then stack and zip-tie the others to the first one. Is that acceptable?

I've also seen (and used) the cable "stackers" that accept up to 4 cables, but that seems like overkill (and expensive) for just 2 cables.

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Yeah, that's what I meant by "stacker" (maybe they're called something else?). I've used those when I have 3 or 4 cables to stack, but like I said, it seems overkill and expensive to use those everywhere that you just have 2 cables to stack?

Thanks for the responses. Does anyone have a link to an example of these "taller" staples? I've looked at the big box stores and haven't seen them. And, I don't know of any other local "retail" electrical supply shops...

Also, unless ActionDave was referring to this, I haven't seen a direct response to the idea of zip-tying one or more stacked cables to a stapled cable. Is this acceptable?

...And, for bundling multiple cables where the 1 1/4" inch rule isn't in effect (like in the attic) ...

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Why do you think the 1 1/4 inch rule isn't in effect in attics? FYI, in Seattle, local amendments to the NEC greatly restrict
the use of NM cable. Basically, with very few exceptions, NM run in attics, unfinished basements and garages, etc., must follow
the same methods as in finished space wall cavities.

You can get wire ties with eyes so they can be fastened to framing with your nail/screw of choice. I've used those quite a bit
to support NM cable, with no objection from Seattle elect. inspectors.

kreemoweet: My word choice was poor. What I should have said was, in the attic, the 1 1/4" rule is less of an issue because you have more space to work with. I think I have followed all rules around wire placement/protection in the attic. Also, yes, I have used the zip-ties with eyelets for attaching to studs -- but getting those to sit right in the middle of a 2x4 seemed unlikely, so I was looking for other options.